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Android encryption

Can someone tell me if the data on Android phone is encrypted? I am assuming here that the device is configured to have full disk encryption enabled.

  1. Is it only encrypted when powered off and decrypted when powered up.
  2. Is it encrypted when the device is locked (equivalent to iOS NSFileProtectionComplete) and decrypted each time the device is unlocked

Also, how different is it between Lollipop and previous versions?